KR940006565Y1 - Chroma/lumina separation for ntsc system - Google Patents
Chroma/lumina separation for ntsc system Download PDFInfo
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- KR940006565Y1 KR940006565Y1 KR2019880018487U KR880018487U KR940006565Y1 KR 940006565 Y1 KR940006565 Y1 KR 940006565Y1 KR 2019880018487 U KR2019880018487 U KR 2019880018487U KR 880018487 U KR880018487 U KR 880018487U KR 940006565 Y1 KR940006565 Y1 KR 940006565Y1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/144—Movement detection
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Abstract
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Description
제1도는 본 고안 NTSC 복합영상신호의 휘도/색도분리회로의 블록도.1 is a block diagram of a luminance / chromatic separation circuit of an inventive NTSC composite video signal.
제2도는 본 고안 NTSC 복합영상신호의 휘도/색도분리회로도.2 is a luminance / chromatic separation circuit diagram of the present invention NTSC composite video signal.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 아날로그/디지탈변환기 2 : 휘도/색도분리회로도1: analog / digital converter 2: luminance / chromatic separation circuit diagram
3 : 크로마디코더 4 : 더블스캔컨버터3: chroma decoder 4: double scan converter
5 : 매트릭스 6 : 디지탈/아날로그변환기5: Matrix 6: Digital / Analog Converter
7 : 스크린 20 : 프레임콤필터7: screen 20: frame comb filter
21 : 라인콤필터부 22 : 움직임적응계수출력부21: line comb filter unit 22: motion adaptation coefficient output unit
23 : 휘도신호출력부 24 : 보간휘도신호출력부23: luminance signal output unit 24: interpolation luminance signal output unit
25 : 색도신호출력부 S1, S2 : 감산기25: chromatic signal output section S1, S2: subtractor
M1-M8 : 승산기 FD1, FD2 : 필드딜레이M1-M8: Multipliers FD1, FD2: Field delay
LD1 : 라인딜레이 LPF1, LPF2 : 저역필터LD1: Line delay LPF1, LPF2: Low pass filter
BPF1, BPF2 : 대역필터 ROM1, ROM2 : 롬BPF1, BPF2: Band filter ROM1, ROM2: ROM
SW1 : 모션스위치 A1, A6 : 간산기SW1: Motion switch A1, A6: Interpolator
본 고안은 복합영상신호의 휘도/색도분리회로에 관한 것으로, 특히 입력 복합영상신호를 2개의 필드메모리와 1개의 라인메모리를 이용하여 화상의 움직임을 검출하고, 휘도신호와 색도신호를 분리함과 아울러 휘도신호를 보간하는데 적당하도록한 NTSC 복합영상신호의 휘도/색도분리회로에 관한 것이다.The present invention relates to a luminance / chromatic separation circuit of a composite video signal. In particular, an input composite video signal is detected using two field memories and one line memory to detect image movement, and separates a luminance signal and a chroma signal. In addition, the present invention relates to a luminance / chromatic separation circuit of an NTSC composite video signal suitable for interpolating a luminance signal.
종래의 휘도/색도분리회로는 움직이는 화상에 있어서, 휘도신호 및 색도신호가 적절히 대응하지 못할 뿐만 아니라 휘도신호 대한 보간이 적절히 이루어지지 않아 해상도를 저하시키는 결함이 있었다.Conventional luminance / chromatic separation circuits have a defect that a luminance signal and a chromaticity signal do not correspond properly in a moving image, and that the interpolation of the luminance signal is not performed properly, thereby lowering the resolution.
본 고안은 이와 같은 결함을 해결하기 위하여 복합영상신호를 2개의 필드메모리와 1개의 라인메모리를 이용하여 화상의 움직임에 따라 그에 따른 휘도/색도신호를 분리하고, 화상의 움직임에 따라 휘도신호를 라인간 프레임간 보간하여 시청자에게 해상도가 높은 화면을 제공할 수 있게 안출한 것으로, 이를 첨부한 도면에 의하여 상세히 설명하면 다음과 같다.In order to solve such a defect, the present invention uses two field memories and one line memory to separate the luminance / chromatic signal according to the movement of the image, and to separate the luminance signal according to the movement of the image. It is designed to provide a viewer with a high resolution screen by interpolating between human frames, which will be described in detail with reference to the accompanying drawings.
제1도는 본 고안의 적용범위를 보인 영상처리기의 전체 블록도로서 이에 도시한 바와 같이, 아날로그의 복합영상신호(Y+G)가 아날로그/디지탈변환기(1)를 통해 4fsc의 샘플링비율로 디지탈변환된 다음 휘도/색도 분리회로부(2)를 통해서는 휘도신호(YR)및 보간된 휘도신호(Y1)를 출력하고, 상기 휘도/색도분리회로부(2) 및 크로마디코더(3)를 통해서는 색차신호(R-Y), (B-Y)를 출력하며, 상기 휘도 신호(YR), 보간된 휘도신호(Y1), 색차신호(R-Y), (B-Y)를 더블스캔컨버터(4)에 공급하여 이로부터 휘도신호(Y) 및 색차신호(R-Y), (B-Y)가 출력되게 하고, 이는 다시 매트릭스(5)를 통해 그의 출력측에 적, 농, 청색용 신호(R), (G), (B)로 출력되며, 이는 다시 디지탈/아날로그변환기(6)를 통해 8fsc로 샘플링된 아날로그의 적, 녹, 청색용 신호(R), (G), (B)신호로 출력되게 구성하였다.FIG. 1 is an overall block diagram of an image processor showing the scope of application of the present invention. As shown in FIG. 1, an analog composite video signal (Y + G) is digitally converted at a sampling rate of 4 fsc through an analog / digital converter (1). Next, the luminance / chromatic separation circuit unit 2 outputs the luminance signal Y R and the interpolated luminance signal Y 1 , and the luminance / chromatic separation circuit unit 2 and the chroma decoder 3 output the luminance signal Y R and the interpolated luminance signal Y 1 . Outputs the color difference signals RY and BY, and supplies the luminance signal Y R , the interpolated luminance signal Y 1 , the color difference signal RY, and BY to the double scan converter 4. From the luminance signal (Y) and the color difference signals (RY), (BY), which are again output to the output side via the matrix (5) red, dark, blue signals (R), (G), (B) It is configured to be output as red, green, and blue signals (R), (G), and (B) signals of the analog sampled at 8 fsc through the digital / analog converter 6 again.
제2도는 본 고안의 휘도/색신호분리 회로도로서 이에 도시한 바와 같이, 필드 딜레이(FD1, FD2), 가산기(A1), 감산기(S1), 승산기(M1, M2)로 구성되어 입력 복합 영상신호(Y+C)를 지연 및 논리합하여 휘도신호(YF) 및 색도신호(CF)를 출력하는 프레임콤필터부(20)와, 라인딜레이(LD1), 가산기(A2), 감산기(S2), 승산기(M3, M4)로 구성되어 상기 입력 복합영상신호(Y+C)를 지연 및 논리합하여 휘도신호(YH)를 출력하는 라인 콤필터부(21)와, 저역필터(LPF2), 롬(ROM1, ROM2)으로 구성되어 상기 프레임콤필터부(20)에서 출력되는 색도신호(CF)를 입력하여 움직임적응계수(K), (1-K)및 움직임검출신호(MS)를 출력하는 움직임 적응계수 출력부(22)와, 가산기(A3~A5), 승간기(M5, M6), 저역필터(LPF1)로 구성되어 상기 프레임콤필터부(20)에서 출력되는 휘도신호(YF), 상기 라인콤필터부(21)에서 출력되는 휘도신호(YH)및 색도신호(CH)를 입력하여 상기 움직임적응계수(1-K), (K)에 따라 움직임에 적용된 휘도신호(YR)를 생성하여 이를 더블스캔컴버터(4)에 출력하는 휘도신호출력부(23)와, 승산기(M7, M8), 가산기(A6)로 구성되어 상기 프레임콤필터부(20)에서 출력되는 휘도신호(YF), 상기 라인콤필터부(21)에서 휘도신호(YH)를 입력하여 상기 움직임적응계수출력부(22)의 움직임적응계수(1-K),(K)에 따라 라인간 프레임간 보간된 휘도신호(YI)를 생성하여 이를 더블스캔컨버터(4)의 입력측에 출력하는 보간휘도신호출력부(24)와, 대역필터(BPF1, BPF2), 보션스위치(SW1) 로 구성되어 상기 움직임적응출력부(22)에서 출력되는 움직임검출신호(MS)의 제어에 따라 상기 프레임콤필터부(20)에서 출력되는 색도신호(CF)를 선택하거나 상기 라임콤필터부(21)에서 출력되는 색도신호(CH)신호를 선택하여 이를 크로마디코더(3)의 입력측에 출력하는 색도신호출력부(25)로 구성한 것으로, 이와 같이 구성한 본 고안의 작용 및 효과를 상세히 설명하면 다음과 같다.FIG. 2 is a luminance / color signal separation circuit diagram of the present invention, which is composed of a field delay (FD1, FD2), an adder (A1), a subtractor (S1), and a multiplier (M1, M2). The frame comb filter unit 20 for delaying and ORing Y + C to output the luminance signal Y F and the chroma signal C F , the line delay LD1, the adder A2, the subtractor S2, A line comb filter 21 configured to multiply the multipliers M3 and M4 and output the luminance signal Y H by delaying and ORing the input composite video signal Y + C, a low pass filter LPF2, and a ROM ROM1, ROM2, and inputs the chroma signal C F outputted from the frame comb filter unit 20 to output the motion adaptation coefficients K, 1-K and motion detection signal MS. A luminance signal Y F composed of an adaptive coefficient output unit 22, adders A3 to A5, interpolators M5 and M6, and low pass filter LPF1 and output from the frame comb filter unit 20, Exit from the line comb filter unit 21 The luminance signal (Y H) and chrominance signal (C H) for input to the motion adaptive coefficient (1-K), (K ) generated by scanning this double Com the luminance signal (Y R) is applied to a motion according to the butter ( 4) the luminance signal output unit 23 outputted to the frame signal, the multipliers M7 and M8 and the adder A6, the luminance signal Y F output from the frame comb filter unit 20, and the line comb filter. 21 a luminance signal (Y H) the motion adaptive coefficient output section 22 to the motion adaptive coefficient (1-K), (K), referred to the human a luminance signal (Y I) interpolated between frames based on the input your in And an interpolation luminance signal output unit 24, a band filter BPF1 and BPF2, and a shunt switch SW1 for generating a P-value and outputting the same to the input side of the double scan converter 4 in the motion adaptation output unit 22. According to the control of the motion detection signal MS outputted, the chroma signal C F output from the frame comb filter unit 20 is selected or the color output from the limecom filter unit 21. It is composed of a chroma signal output unit 25 that selects the signal (C H ) signal and outputs it to the input side of the chroma decoder 3, the operation and effect of the present invention configured as described in detail as follows.
아날로그/디지탈변환기(1)에서 출력되는 디지탈변환된 NTSC 복합영상신호(Y+C)가 가산기(A1)의 일측입력단자에 공급되고, 필드딜레이(FD1)(FD2)를 통해서는 1프레임 지연된 복합영상신호(Y-C)가 가산기(A1)의 타측입력단자에 공급되어 그 가산기(A1)에서 휘도신호(2Y)가 출력되고, 1/2승산용 승산기(1M)을 통해 2로 제산되어 그 승산기(M1)에서 취도신호(YF)가 출력된다.The digitally converted NTSC composite video signal (Y + C) output from the analog / digital converter 1 is supplied to one input terminal of the adder A1, and the composite delayed by one frame through the field delays FD1 and FD2. The video signal YC is supplied to the other input terminal of the adder A1, and the luminance signal 2Y is output from the adder A1, divided by 2 through the 1/2 multiplier 1M, and the multiplier ( In M1), the degree of turbidity signal Y F is output.
그리고, 상기 디지탈신호로 변환된 복합영상신호(Y+C)가 다른 한편으로는 감산기(S1)의 일측입력단자에 공급되고, 상기 필드딜레이(FD1)(FD2)를 통해서는 1프레임 지연된 복합영상신호(Y-C)가 그 감산기(S1)의 타측입력단자에 공급되어 그 감산기(S1)에서 색도신소(2C)가 출력되며, 이는 1/2승산용 승산시(M2)를 통해 2로 제산되어 그 승산기(M2)에서 색도신호(CF)가 출력된다.The composite image signal Y + C converted to the digital signal is supplied to one input terminal of the subtracter S1, and the composite image delayed by one frame through the field delays FD1 and FD2. The signal YC is supplied to the other input terminal of the subtractor S1, and the chroma subtractor 2C is output from the subtractor S1, which is divided by 2 through the multiplication M2 for 1/2 multiplication. The chroma signal C F is output from the multiplier M2.
한편, 상기 디지탈신호로 변환된 NTSC 복합영상신호(Y+C)는 상기 같은 방법으로 라일딜레이(LD1), 가산기(A2), 승산기(M3)를 통해 라인단위로 처리되어 그 승산기(M3)에서 휘도신호(YH)가 출력되고, 라인딜레이(LD1), 감산기(S2), 승산기(M4)를 통해 라인단위로 처리되어 그 승산기(M4)에서 색도신호(CH)가 출력된다.On the other hand, the NTSC composite video signal (Y + C) converted into the digital signal is processed in the unit of line through the relay delay LD1, the adder A2, and the multiplier M3 in the same way as the multiplier M3. The luminance signal Y H is output, processed in line units through the line delay LD1, the subtractor S2, and the multiplier M4, and the chroma signal C H is output from the multiplier M4.
이와함께 상기 승산기(M2)에서 출력되는 색도신호(CF)는 저역필터(LPF2)를 통해 필드와 필스 사이에서 휘도신호(Luminance)의 고주파성분이 제거되고, 이 저역필터(LPF2)의 출력신호는 다시 롬(ROM1)에 공급되어 이로부터 움직임적응계수(K), (1-K)가 출력되며, 롬(ROM2)에 공급되어서는 이로부터 움직임검출신호(MS)가 출력되는데, 여기서, 상수 K는 0K1의 값으로 화상의 뭉직임이 있을때 K=1이고, 없을때 K=0이다.In addition, the high-frequency component of the luminance signal Luminance is removed between the field and the field through the low pass filter LPF2 and the chroma signal C F output from the multiplier M2 is outputted from the low pass filter LPF2. Is again supplied to the ROM (ROM1), and the motion adaptation coefficients (K) and (1-K) are output therefrom, and when supplied to the ROM (ROM2), the motion detection signal (MS) is output therefrom. K is 0 K A value of 1 means K = 1 with image aggregation, and K = 0 without.
한편 , 상기 저역필터(LP2)에서 출력되는 루미넨스 고주파성분이 가산기(A3)의 타측입력단자에 공급되어 그의 일측입력단자간에 공급되는 승산기의(1)에서 출력된 휘도신호(YF)와 함께 가산되고, 일허게 신호가 승산기(M5)에 공급되어 상기 롬(ROM1)에서 출력되는 움직임적응계수 (1-K)로 승상된 다음 다음 가산기(A5)의 일측 입력단자에 공급된다.Meanwhile, the luminance high frequency component output from the low pass filter LP2 is supplied to the other input terminal of the adder A3 and together with the luminance signal Y F output from the multiplier 1 supplied between the one input terminals thereof. The signal is added to the multiplier M5, the signal is supplied to the motion adaptation coefficient 1-K output from the ROM ROM1, and then supplied to one input terminal of the next adder A5.
또한, 상기 승산기(M4)에서 출력되는 색도신호(CH)는 저역필터(LPF1)을 통해 루미넨스 고주파성분이 검출되어 가산기(A4)에서 상기 승산기(M3)의 출력 휘도신호(YR)와 가산된 다음 승산기(M6)에 공급되어 상기 롬(ROM1)에서 출력되는 움직임적응계수(K)로 승산된 후 상기 가산기(A5)에 공급되어 상기 승산기(M5)의 출력신호와 가산되므로 이 가산기(A5)에서는 움직임에 적용된 휘도신호(YR)가 생성되고, 이는 더블스캔컨버터(4)의 입력측으로 공급된다.In addition, the luminance signal C H output from the multiplier M4 is detected by a low-frequency filter LPF1 and a luminance high frequency component is detected so that the adder A4 outputs the output luminance signal Y R of the multiplier M3. Is added to the multiplier M6, multiplied by the motion adaptation coefficient K output from the ROM ROM1, and then supplied to the adder A5 and added to the output signal of the multiplier M5. In A5), the luminance signal Y R applied to the movement is generated, which is supplied to the input side of the double scan converter 4.
한편, 승산기(M1), (M3)에서 각기 출력되는 휘도신호(YF), (YH)는 승산기(M7), (M8)의 입력단자에 공급되어 움직임적응계수(1-K), (K)로 각기 승산되어 라인간 프레임간 보간돤 휘도신호가 생성되고, 이는가산기(A6)에서 가산된 다음 상기 더블스캔컨버터(4)의 입력측으로 출력된다.On the other hand, the luminance signals Y F and (Y H ) respectively output from the multipliers M1 and M3 are supplied to the input terminals of the multipliers M7 and M8 to provide the motion adaptation coefficients 1-K and ( Each multiplied by K) produces an inter-frame interpolation luminance signal, which is added by the adder A6 and then output to the input side of the double scan converter 4.
또한, 상기 승산기(M2)에서 출력되는 색도신호(CF)는 대역필터(BPF2)에 공급되어 크도스토크(Cross Talk)성분이 제거된 다음 모션스위치(SW1)의 고정단자(a)에 공급되고, 상기 승산기(M4)에서 출력되는색도신호(CH)는 대역필터(BPF1)를 통해 루미넨스의 고주파성분(크로스컬러성분)이 제거된 후 상기 모션스위치(SW1)의 고정단자(b)에 공급된다.In addition, the chroma signal C F output from the multiplier M2 is supplied to the band filter BPF2 to remove the cross talk component and then to the fixed terminal a of the motion switch SW1. The chroma signal C H output from the multiplier M4 is a fixed terminal b of the motion switch SW1 after the high frequency component (cross color component) of the luminance is removed through the band filter BPF1. Supplied to.
이와같은 상태에서, 상기 롬(ROM2)에서 움직임검출신호(MS)가 출력될때에는 그 움직임검출신호(MS)에 의해 상기 모션스위치(SW1)의 가동단자 (S1)가 고정단자(b)에 단락되어 라인콤필터부(21)의 휘도/색도분리에 의한 색도신호(CH)가 선택되고, 그 움직임검출신호(MS)가 출력되지 않을때에는 상기 가동단자(S1)가 고정단자(a)에 단락되어 프레임콤필터부(20)에 휘도/색도분리에 의한 색도신호(CF)가 선택되므로 그 모션스위치(SW1)에서 움직임에 적응된 색도신호(C)가 출력되고 , 이는 크로마디코터(3)의 입력측으로 공급된다.In this state, when the motion detection signal MS is output from the ROM ROM2, the movable terminal S1 of the motion switch SW1 is short-circuited to the fixed terminal b by the motion detection signal MS. When the chroma signal C H by the luminance / chromatic separation of the line comb filter unit 21 is selected, and the motion detection signal MS is not output, the movable terminal S1 is connected to the fixed terminal a. Since the chroma signal C F by the luminance / chromatic separation is selected to the frame comb filter unit 20 by the short circuit, the chroma signal C adapted to the movement is output from the motion switch SW1. It is supplied to the input side of 3).
이상에서 상세히 설명한 바와 같이 본 고안은 복합영상신호를 2개의 필드메모리와 1개의 라인메모리를 이용하여 화상의 움직에 따라 휘도신호를 라인간 프레임간 보간함으로써 시청자에게 해상도가 높은 화면을 제공할 수 있는 효과가 있다.As described in detail above, the present invention can provide a screen having high resolution to viewers by interpolating a luminance signal between lines between frames as the image moves using two field memories and one line memory. It works.
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